吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (5): 1448-1456.doi: 10.13278/j.cnki.jjuese.20180224

• 地球探测与信息技术 • 上一篇    下一篇

时间域航空电磁系统探测深度研究

韩雪, 殷长春, 任秀艳, 刘云鹤, 张博, 蔡晶   

  1. 吉林大学地球探测科学与技术学院, 长春 130026
  • 收稿日期:2018-08-24 发布日期:2019-10-10
  • 通讯作者: 殷长春(1965-),男,教授,国家"千人计划"特聘专家,主要从事电磁勘探理论特别是航空和海洋电磁方面的研究,E-mail:yinchangchun@jlu.edu.cn E-mail:yinchangchun@jlu.edu.cn
  • 作者简介:韩雪(1996-),女,硕士研究生,主要从事电磁法正演理论及方法技术研究,E-mail:hanxue18@mails.jlu.edu.cn
  • 基金资助:
    国家重点研发计划项目（2016YFC0303100，2017YFC0601903，2018YFC0603300）；中央级公益性科研院所基本科研业务费专项经费项目（JYYWF20180103）；国家自然科学基金项目（41530320，41774125）；中科院先导专项（XDA14020102）

Research on Exploration Depth of Time-Domain Airborne EM System

Han Xue, Yin Changchun, Ren Xiuyan, Liu Yunhe, Zhang Bo, Cai Jing   

  1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China
  • Received:2018-08-24 Published:2019-10-10
  • Supported by:
    Supported by National Key R & D Program of China (2016YFC0303100, 2017YFC0601903,2018YFC0603300), Special Funds for Basic Research of the Central Public Research Institutions (JYYWF20180103), National Natural Science Foundation of China (41530320, 41774125) and Pilot Project of Chinese Academy of Sciences (XDA14020102)

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摘要： 时间域航空电磁系统探测深度与采样时间、发射磁矩、大地电导率、仪器背景噪声和灵敏度等诸多因素相关。本文基于时间域航空电磁一维正演对时间域航空电磁系统探测深度进行研究。正演算法从麦克斯韦方程出发，结合准静态近似条件，得到一维层状介质上空中心回线频率域电磁场响应的垂直分量，并采用汉克尔积分进行计算，进而通过时-频变换获得时间域电磁场响应。探测深度研究参考仪器背景噪声水平，通过设定最小可识别信号阈值（本文设定为系统背景噪声三倍）获取最大可探测分离时间，进而利用该分离时间结合平均电导率求取最大探测深度。最后本文以VTEM系统为例，对不同层状介质模型以及不同发射磁矩、背景噪声、发射脉宽和飞行高度下的时间域航空电磁系统最大探测深度进行分析和讨论。

关键词: 时间域, 航空电磁, 探测深度, 噪声水平

Abstract: The exploration depth of a time-domain airborne electromagnetic (EM) system is closely related to many factors such as sampling time, transmitting dipole moment, earth conductivity, instrument background noise,and sensitivity. This study is about the exploration depth of time-domain airborne EM systems based on time-domain one-dimensional forward modeling. The forward algorithm starts from the Maxwell equation and combines the quasi-static approximation conditions to obtain the vertical component of the EM field response in the frequency domain of the central loop over a one-dimensional layered medium. Hankel integral is used to calculate the EM responses in frequency-domain and then obtain the time-domain responses via time-frequency transform. We set the minimum identifiable signal threshold to be three times of the system background noise level to obtain the maximum detectable departure time, from which we obtained the maximum depth of exploration with the average conductivity. Finally, taking the VTEM system as an example, we analyzed and discussed the maximum exploration depth of airborne EM system in the time domain under different layered media models and different transmission magnetic moments, background noise, transmission pulse width and flight altitude.

Key words: time-domain, airborne EM, exploration depth, noise level

中图分类号: 

  • P613.3
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